Solve for x
x=\frac{y-600}{20}
Solve for y
y=20\left(x+30\right)
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20x+600=y
Swap sides so that all variable terms are on the left hand side.
20x=y-600
Subtract 600 from both sides.
\frac{20x}{20}=\frac{y-600}{20}
Divide both sides by 20.
x=\frac{y-600}{20}
Dividing by 20 undoes the multiplication by 20.
x=\frac{y}{20}-30
Divide y-600 by 20.
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